library install fixes - bin for dlls, and LIB_SUFFIX convention

The LIB_SUFFIX is a KDE CMake convention.
LIB_SUFFIX should be 64 on redhat x64 systems,
otherwise its blank when unspecified.

The second change puts *.dlls in the runtime path.

install(
    TARGETS ${LIBNAME}
    LIBRARY DESTINATION lib${LIB_SUFFIX} # .so file
    ARCHIVE DESTINATION lib${LIB_SUFFIX} # .lib file
    RUNTIME DESTINATION bin              # .dll file
    )